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FISHERIES MONITORING of the RIBBLE CATCHMENT 2019 the Ribble Rivers Trust

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FISHERIES MONITORING of the RIBBLE CATCHMENT 2019 the Ribble Rivers Trust ABSTRACT 2019 marks the 12th year of The Ribble Trusts inter- annual fisheries monitoring programme. Results and observations from this work helps inform the trust on the productivity of sub-catchment fisheries and where to direct conservation efforts. Adam Wheeler Fisheries Monitoring Officer FISHERIES MONITORING OF THE RIBBLE CATCHMENT 2019 The Ribble Rivers Trust Fisheries Monitoring of the Ribble Catchment Ribble Rivers Trust C/O Hanson Cement Ribblesdale Works Clitheroe BB7 4QF Phone: 01200 444452 E-mail: [email protected] Report title: Fisheries Monitoring of The Ribble Catchment 2019 Report reference: RRT_ Electric_Fishing _2019_Report Report version: 1.0 Date: 01/11/2019 Prepared for: Ribble Rivers Trust Authored by: Adam Wheeler - Fisheries Monitoring Officer Checked by: Mike Forty - Catchment Science Coordinator Copyright Ribble Rivers Trust, 2019. This report has been prepared using due skill, care and diligence for the exclusive use of the commissioning party by Ribble Rivers Trust. No liability is accepted by Ribble Rivers Trust for the use and or application of the contents of the report. Fisheries Monitoring of the Ribble Catchment Table of Contents Acknowledgments ....................................................................................................................................................... i Executive Summary ....................................................................................................................................................1 Introduction ............................................................................................................................................................1 Fishery Results 2019 ...............................................................................................................................................3 1.0 Introduction ..........................................................................................................................................................6 1.1 Sub-Catchment Map .........................................................................................................................................7 2.0 Methodologies......................................................................................................................................................8 2.1 Electric fishing Surveys .....................................................................................................................................8 3.0 Monitoring Results ............................................................................................................................................ 10 3.1 Brown Trout (Salmo trutta) ........................................................................................................................... 10 The Calder Catchment ..................................................................................................................................... 13 The Hodder Catchment ................................................................................................................................... 15 The Lower Ribble Catchment .......................................................................................................................... 17 The Mid-Ribble Catchment .............................................................................................................................. 18 The Upper Ribble Catchment .......................................................................................................................... 20 3.2 Atlantic Salmon (Salmo salar) ....................................................................................................................... 22 The Calder Catchment ..................................................................................................................................... 25 The Hodder Catchment ................................................................................................................................... 26 The Mid-Ribble Catchment .............................................................................................................................. 28 The Upper Ribble Catchment .......................................................................................................................... 30 3.3 Other Species ................................................................................................................................................. 32 3.4 Length-Weight Relationships and Biomass ................................................................................................... 35 Condition Factor .............................................................................................................................................. 35 Biomass ............................................................................................................................................................ 39 4.0 Discussion .......................................................................................................................................................... 41 5.0 References ......................................................................................................................................................... 43 6.0 Appendices ........................................................................................................................................................ 45 6.1 Appendix A .................................................................................................................................................... 45 6.2 Appendix B ..................................................................................................................................................... 46 6.3 Appendix C ..................................................................................................................................................... 50 i | P a g e Fisheries Monitoring of the Ribble Catchment Acknowledgments The core fisheries monitoring of the Ribble catchment has been supported and funded by Ribble Rivers Trust and its members. Funding has also been issued from the England European Regional Development Fund as part of the European Structural and Investment Funds Growth Programme 2014-2020, for the monitoring of the Primrose Lodge Blue and Greenway project. We are grateful to all involved landowners for their permission to land-access and look forward to continued cooperation for future work. The Ribble Trust wishes to thank the following researchers, staff, and volunteers whose help and continued enthusiasm has proved invaluable during this year’s survey program: Ellie Brown, Mike Forty, Helen Smith (RRT); Kate Cartmell Done and Kate Morgan (RRT, Seasonal Survey Assistants); Lynn Yates, Marco Dobson, Paul Sharples, Tony Cookson Lucy Wilde (Electric Fishing Volunteers). i | P a g e Fisheries Monitoring of the Ribble Catchment Executive Summary Introduction The Ribble Rivers Trust has concluded the 12th year of its fisheries monitoring programme of the Calder, Hodder and Ribble catchments. Additional and repeat surveys have also been performed on the River Darwen to continue the capital work assessment from the Ribble Life Together programme. The methodology applied in the fisheries programme uses quantitative and semi-quantitative surveys to assess catchment salmonid productivity using an adapted Crozier and Kennedy (1994) electric fishing method. For 2019 an improvement to the programme’s methodology has been made, Zippin’s (1956,1958) K-Pass Removal method has been applied to increase the accuracy of density estimations. This methodology has also been applied to previous years data (2008-2018) to make it comparable and allow for trends to be observed. As juvenile fish densities change rapidly with age, surveys are conducted at a similar time each year (June – October) and in the same area to allow for valid comparisons. A total of 328 sites were surveyed in 2019 covering 5 sub-catchments. Salmonids are a keystone species within the river system, they rely on ecological stability and are indicators of water and habitat quality. The Ribble Trust uses the National Fisheries Classification Scheme (NFCS) to allow for the standardisation of results by grading sites based on the densities of fry comparable to the national dataset. Results of electric fishing surveys are used to support and identify future works as well as monitoring the long-term impacts of migration and habitat restoration schemes. With anthropogenically driven climate change, we are seeing more extreme weather patterns, increased probability of high intensity rainfall events and longer dry periods. With the summer of 2018 dominated by warm weather and below average rainfall, drought conditions were seen across the Ribble catchment. Mean temperatures of 17.2°C were documented by the Met Office making it the hottest summer on record. There were concerns for the +0 salmonids targeted during the 2018 survey season, as fry are more sensitive to extremely low flows due to poor mobility and ability to seek refuge. Overall the UK had 48% of average rainfall of the 1981-2010 average during the summer months and by the end of October groundwater and river levels remained below average. 2018 Summers lowest flows coincided with the main run of sea trout in July and in the Autumn months minimal spate events took place from the end of September
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